Strengthen research If you are looking for internal FM antenna, then you must find a way, the level of reception you get. After all, we can not enjoy your stereo, if you’re still poor signal reception.
There are few manufacturers with them in a variety of models and specifications. If

Looking at the antenna.web page more, I see alot of transmitters in that general direction.

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Channel Vhf | Pro Audio and Stage Lighting

This antenna works well for analog reception but is just about useless for digital reception. We’re slightly over 6 miles from major network transmitters , no obstructions in the way, west side in Portland, OR. …

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I live in the mountains about 90 miles from the transmitter towers.

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Antennas Direct 91XG

Radio waves are generated by electrons accelerating in the antenna.
Consider a transmitter perpendicular to the ground. The electrons in the antenna, when a signal is applied, are changing their velocities continuously (i.e. moving up and down very quickly) in response to the applied signal.
For a station that broadcasts at a wavelength of 1500m, the antenna needs to be 750m long. This is because there is a ‘virtual antenna’ caused by the aerial being earthed in the ground: